<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像 -->
      <div class="avatar_box">
        <img src="@/assets/logo.png" alt="" />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item label="" prop="username">
          <el-input
            v-model="loginForm.username"
            prefix-icon="iconfont icon-users"
          ></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item label="" prop="password">
          <el-input
            type="password"
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
          ></el-input>
        </el-form-item>
        <!-- 验证码 -->
        <el-form-item prop="verifyCode" class="verifyCodeItemCss">
          <el-input
            class="verify_css"
            placeholder="请输入4位验证码"
            v-model="loginForm.verifyCode"
            @keyup.enter.native="login('loginForm')"
          ></el-input>
          <!--关键 ↓-->
          <div id="v_container"></div>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item label="" class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
import $ from '../plugins/jquery.js'
import { GVerify } from '../plugins/verifyCode.js'

export default {
  data() {
    return {
      // 登录表单数据绑定对象
      loginForm: {
        username: 'admin',
        password: '123456',
        verifyCode: '',
      },
      // 这是表单的验证规则
      loginFormRules: {
        // 验证用户名是否合法
        username: [
          { required: true, message: '请输入用户名', trigger: 'blur' },
          {
            min: 3,
            max: 12,
            message: '长度在 3 到 12 个字符',
            trigger: 'blur',
          },
        ],
        // 验证密码是否合法
        password: [
          { required: true, message: '请输入密码', trigger: 'blur' },
          {
            min: 6,
            max: 16,
            message: '长度在 6 到 16 个字符',
            trigger: 'blur',
          },
        ],
        verifyCode: [
          { required: true, message: '请输入验证码', trigger: 'blur' },
        ],
      },
      verifyCode: null,
    }
  },
  mounted() {
    // 随机播放帧数
    this.videoCut()

    this.verifyCode = new GVerify('v_container')
  },
  
  methods: {
    login(formName) {
      var that = this
      // 获取验证码
      var verifyCode = this.loginForm.verifyCode
      var verifyFlag = this.verifyCode.validate(verifyCode)
      if (!verifyFlag) {
        return this.$message.error('验证码输入错误')
      } else {
        this.$message.success('验证码正确')
      }

      // 获取到表单的引用对象，进行预校验
      this.$refs.loginFormRef.validate(async (valid) => {
        if (!valid) return
        // 获取后面内容的data重命名为res
        const { data: res } = await this.$http.post('login', this.loginForm)
        if (res.meta.status !== 200) return this.$message.error('登录失败')

        // 引用$message弹出方法
        this.$message.success('登录成功')

        //1．将登录成功之后的 token，保存到客户端的sessionstorage中
        //1.1项目中出了登录之外的其他API接口，必须在登录之后才能访问
        //1.2 token只应在当前网站打开期间生效，所以将 token I保存在sessionStorage 中
        window.sessionStorage.setItem('token', res.data.token)

        //2．通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push('/home')
        console.log(res)
      })
    },
    resetLoginForm() {
      // 重置调用resetFields()
      this.$refs.loginFormRef.resetFields()
    },
    submitForm(formName) {},

    videoCut() {
      $('video').on('loadedmetadata', function (event) {
        var duration = Math.ceil(this.duration)
        this.currentTime = Math.round(Math.random() * duration)
      })
    },
  },
}
</script>

<style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  height: 100%;
  position: relative;
  .login_box {
    width: 450px;
    height: 360px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);
    .avatar_box {
      width: 130px;
      height: 130px;
      border: 1px solid #eee;
      border-radius: 50%;
      padding: 10px;
      box-shadow: 0 0 10px #ddd;
      position: absolute;
      left: 50%;
      transform: translate(-50%, -50%);
      background-color: #fff;
      img {
        width: 100%;
        height: 100%;
        border-radius: 50%;
        background-color: #eee;
      }
    }
    .login_form {
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
    }
    .btns {
      display: flex;
      justify-content: center;
    }
  }
}
.input-val {
  width: 250px;
  // height: 32px;
  // border: 1px solid #ddd;
  // box-sizing: border-box;
  margin: 0 10px 10px 0;
}
#canvas {
  width: 100px;
  height: 40px;
  vertical-align: middle;
  box-sizing: border-box;
  border: 1px solid #ddd;
  cursor: pointer;
  border-radius: 4px;
}
.verify_css {
  width: 50%;
  margin-right: 5%;
}
#v_container {
 width: auto;
 height: 40px;
 display: inline-flex;
 position: relative;
 top: 1rem;
 margin-top: -2rem;
}
</style>
